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  1. engrrk

    Type testing of pumps

    Thanks for the clarification, EdStainless.
  2. engrrk

    Type testing of pumps

    Dear all, Can anyone clarify what does the term type testing for pumps mean? The technical specifications for the pumps read as "All the pump models offered shall be type tested on the particular model". Thanks.
  3. engrrk

    Close-off pressure for low flow bypass valve

    Hi, While selecting the low flow bypass valve across the chiller to bypass the chilled water at low load conditions, which of the following should be considered as the close-off pressure for the valve selection? 1) The pressure developed by the chilled water pump at its minimum speed? or 2) The...
  4. engrrk

    Minimum air off-coil temperature

    Dear tys90, Thanks. From my reply above, I understand that the temperature at which CHW and air becomes same is 17.5C and hence there cannot be any heat transfer beyond this. This could be the determining factor of how low a CRAC/AHU can supply. Agree? Regarding your point on efficiency at...
  5. engrrk

    Minimum air off-coil temperature

    Dear ChasBean1, Thanks for your reply. I understood your point. In order to cool the air at 19C to 11C, I need to supply CHW at 3C. The equilibrium in air and water side will be reached at 11C. Right? But how does this apply when the CHWS/R is at 10C/17C and return air/supply air are at...
  6. engrrk

    Minimum air off-coil temperature

    Dear SAK9, I missed the point that we cannot cool the air to 9C when the water is supplied at 10C. Thanks for bringing up this basic principle. You have mentioned that to cool the air to 11C, we will need coil of infinite size. Is that right? After going through ChasBean1's response, I realize...
  7. engrrk

    Minimum air off-coil temperature

    Dear engineers, For one of my projects, the vendor has selected a computer room air-conditioning unit (CRAC). The selection parameters are as below: Supply air temperature from the unit = 19 deg C Return air temperature to the unit = 30 deg C Net sensible cooling capacity = 110 kW But, as per...
  8. engrrk

    Erection of chillers

    Hi 317069, Thanks for your reply. In this suggested way of pushing the chillers, will there be any holding/hanging beams required to hang the chillers and push them in? Generally the chiller manufacturer recommends to have a clearance of 1m above the chiller for hoisting. Any idea, is there...
  9. engrrk

    Erection of chillers

    Hi HerrKaLeun, Thanks for your reply. In my project, there are 5 chillers and not all these 5 chillers are installed on the day-1. Initially 2 chillers are installed and later, when the need for air-conditioning load arises, further chillers are added. Also, the roof of the chiller plant room...
  10. engrrk

    Erection of chillers

    Hi, Can anyone advice me how to erect a 1500RT water cooled chiller (around 25,000 kg) in a covered plant room located at the roof slab? I understand that the chillers can be lifted to the roof floor slab using cranes/hoists. But how to move in the chillers into the plant room and how to place...

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